/Engine/Source/Runtime/Online/BuildPatchServices/Public/BuildPatchDelta.h
Based on the source and destination manifests, get the filename for the delta that optimises patching from source to destination.
the CloudDir relative delta filename.
namespace BuildPatchServices { [FString](API\Runtime\Core\Containers\FString) BuildPatchServices::GetChunkDeltaFilename ( const IBuildManifestRef & SourceManifest, const IBuildManifestRef & DestinationManifest ) }